Figure 132 on – Nortel Networks Circuit Card User Manual

Page 596

NT8D14 Universal Trunk card

553-3001-211 Standard 3.00 August 2005

Figure 132
Two-way, loop DR, TIE trunk call states – incoming call through senderized, tandem PBX
from a CO/FX/WATS trunk

System (near) end

Ground on tip,

battery on ring

Battery on tip,

ground on ring

Battery-ground

or loop pulsing,

or DTMF

(Note 1)

Far end

originates

Idle

Far end

hangs up

(Note 4)

Far end

disconnects

first

Far end

disconnects

first

Far end

disconnects

Near end

disconnects

CO/FX/WATS

ground start

disconnect

Near end

stores

office DN

(Note 2)

Near end

answers

(ans sup)

(Note 3)

CO end
answers

(no ans sup)

553-AAA1143

Note 1:

Dial CO/FX/WATS and office DN.

Note 2:

If ground start trunk, outpulse toward office after ground detection.

If loop start trunk, outpulse toward office 1 second later.

Note 3

: Pseudo-answer supervision is provided by near end at expiration of

end-of-dial timer.

Note 4:

Where no far-end answer supervision is provided, party at far end

hangs up after recognizing near-end call termination.

Far end PBX

High-resistance

loop

Ground on tip,

battery on ring

Low-resistance

loop